Geyser jet nozzle produces an output fountain jet that combines a mixture of water from the immersed pump, water from the pond and air. High water fountain jet performed by a Geyser Nozzle The end jet pattern is a column of white water, created by mixing air and water together. Because water is drawn from the fountain pond. It is important that this level of water is maintained to ensure the performance levels given in the chart. They are equipped with tilt correctors to prevent unwanted jet inclination. The smaller sized geyser jet nozzles (1/2" and 1") are made of 100% cast and machined brass, while the larger sizes (1½”, 2, 2½" and 3”) are a mixture of stainless steel and brass.